Sheldon: Jacuzzi is a commercial brand, hot tub is the generic term, i.e., all Jacuzzis are hot tubs, but not all hot tubs are Jacuzzis.Zack: Is that like all thumbs are fingers but not all fingers are thumbs?Sheldon: Surprisingly, yes.Zack: Nice! Now what exactly are toes?

Leonard: You'll never guess what just happened.Sheldon: You went out in the hallway, stumbled into an inter-dimensional portal, which brought you 5,000 years into the future, where you took advantage of the advanced technology to build a time machine, and now you're back, to bring us all with you to the year 7010, where we are transported to work at the think-a-torium by telepathically controlled flying dolphins? Leonard: No.Sheldon: Awww.Leonard: Penny kissed me.Sheldon: Who would ever guess that?

Sheldon: I'd like to go over some proposed changes to the roommate agreement, specifically to address Penny's annoying personal habits.Penny: Oh my God! What personal habits?Sheldon: I have a list. FYI overuse of the phrase "Oh my God" is number 12.

Howard: On the potty, what are you five?Raj: It's a potty, what do you call it?Howard: A toilet.Raj: That's a little vulgar for the dinner table, don't you think?Howard: And potty is okay?Raj: Potty is innocent. Potty is adorable.Howard: What do you do on the potty, wee-wee?Raj: If I don't have to boom-boom.

Wolowitz: Raj, did you ever tell your sister about the time Sheldon got punched by Bill Gates?Priya: Oh, God, you're kidding.Raj: No, Gates gave a speech at the university. Sheldon went up to him afterwards and said, "Maybe if you weren't so distracted by sick children in Africa you could have put a little more thought into Windows Vista."Leonard: Bam, right in the nose. Made me proud to own a PC.